Using a strong password is among the most important steps you can take to protect your computer from hackers and other unwelcome users.
If you are logged on as an administrator, you can create a password for any account.
If you are connected to a domain, Group Policy settings might prevent you from completing these steps.
The steps that you should follow will vary, depending on whether your computer is on a domain or a workgroup. To find out, see "To check if your computer is on a workgroup or domain" in How is a network at home different from one at work?
Click Manage User Accounts.
If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
On the Users tab, click the account you want to create a password for, and then click Reset Password.
Type the password in the New password box, type the password again in the Confirm new password box, and then click OK.
Click Create a password for your account.
If your user account already has a password, you can change your password by clicking Change your password.
Type the password in the New password box, and then type the password again in the Confirm new password box.
If you would like to use a password hint, type the hint in the Password hint box.
Click Create password.